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Useful commands to
research and try
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ssh – Secure Shell – used to remote control a system via the command prompt
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scp – Secure Copy – used to transfer files between computers over SSH
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cat – Concatenate – used to print a view the contents of a file.
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chmod – Change file mode bits – used to change permissions of a file for user, group & other
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chown – Change Owner – used to change the user ownership of a file
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chgrp – Change Group – used to change the group ownership of a file
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gzip – Gunzip – file compression / decompression command for the .gz format
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tar – file compression / decompression command for the .tar format
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sudo – command to gain root access to a system (useful when combine with su. e.g: ‘sudo su’)
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lynx – console-based web-browser
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alpine / pine – an email client
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nano – text editor (See previous pages for a brief How-to)
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vim – advanced text editor – not for the faint hearted (try the command ‘vimtutor’)
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ping – Sends ICMP ECHO_REQUEST to network hosts to determine their connectivity status
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nc – netcat, used to listen / send TCP & UDP packets
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nmap – Network Mapper – Tool for network exploration & Security auditing – Very involved
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telnet – basic (unencrypted) method of controlling a system. Useful for interrogating ports
